21363929 has 8 divisors (see below), whose sum is σ = 22470912. Its totient is φ = 20283120.

The previous prime is 21363907. The next prime is 21363949. The reversal of 21363929 is 92936312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21363929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21363949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4859 + ... + 8144.

It is an arithmetic number, because the mean of its divisors is an integer number (2808864).

Almost surely, 2^21363929 is an apocalyptic number.

It is an amenable number.

21363929 is a deficient number, since it is larger than the sum of its proper divisors (1106983).

21363929 is a wasteful number, since it uses less digits than its factorization.

21363929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13087.

The product of its digits is 17496, while the sum is 35.

The square root of 21363929 is about 4622.1130449179. The cubic root of 21363929 is about 277.4770329719.

The spelling of 21363929 in words is "twenty-one million, three hundred sixty-three thousand, nine hundred twenty-nine".